Machine Learning Engineer + Data Scientist + Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Use Bayes for factory identification
Bayesian inference: Which factory given two black widgets? Setup - Two factories produce red and black widgets. - Factory A: 40% red, 60% black. -...
Design VPC, IP plan, management, storage, SSO
Design VPC, IP plan, management, storage, SSO System Design: Multi‑Layer VPC, IP Planning for 2,000 Servers, Fleet Management, Shared Storage, and SSO...
Implement core graph algorithms for graphics
Implement core graph algorithms for graphics Given a scene or dependency graph, implement topological sort, BFS/DFS, and shortest path (Dijkstra). Dis...
Explain move and recent project
Explain move and recent project Behavioral + Project Deep-Dive: Motivation and Recent Project Context: Onsite behavioral prompt for a Quantitative Sof...
Design a Lens Recommendation System
Design a recommendation system for augmented-reality lenses in a social camera application. Your design should cover: - product goals and success metr...
Explain challenges in training multimodal LLMs
Machine Learning discussion Answer conceptually (no code). Assume you are training or adapting a multimodal large model (e.g., text + image, or text +...
Scale median under memory constraints
Scale median under memory constraints Design a Scalable Streaming Median Service Under Memory Constraints Context You are building a service that cons...
Differentiate virtual and pure virtual functions
Differentiate virtual and pure virtual functions In C++, what is the difference between a virtual function and a pure virtual function? Provide syntax...
Design a post privacy/visibility system
Design a privacy system for social media posts (similar to Facebook post privacy). Requirements: - Each post can be: Public, Friends, Friends-of-frien...
Design a large-scale web crawler
Design a web crawler that continuously discovers and downloads web pages. Requirements: - Start from seed URLs and crawl at scale. - Avoid duplicate c...
Design a real-time game leaderboard
Design a real-time leaderboard for an online game. Requirements: - Players submit score updates frequently. - Query top N players globally and per reg...
Design an ad click aggregation service
Design a backend service that ingests ad impression and click events and provides aggregated metrics. Requirements: - Ingest a high-volume stream of e...
Design a Retrieval-Augmented Generation (RAG) System
Design a retrieval-augmented generation (RAG) system for a production question-answering product. Users ask natural-language questions, and the system...
Walk through project scope, ownership, and decisions
Walk through project scope, ownership, and decisions Behavioral: Walk Through a Significant Project (Technical Screen — Software Engineer) Provide a d...
Explain HashMap internals and collisions
Explain HashMap internals and collisions In Java, describe the underlying data structures used by HashMap (e.g., array of buckets, linked lists vs tre...
Discuss project pride, conflict, and pivots
Discuss project pride, conflict, and pivots Behavioral & Leadership (Technical Screen) Context You are a software engineer in a technical screen that ...
Describe your proudest project and dive deep
Describe your proudest project and dive deep Behavioral Prompt: Project You’re Most Proud Of Context: Onsite software engineer behavioral interview. C...
Model booking auxiliary comments with admin updates
Design an object-oriented model (and high-level system design) for a booking system feature that stores auxiliary comments on a reservation. Core requ...
Design an End-to-End ML System
Design an End-to-End ML System System Design: Real-Time Recommendation ML System Context You are tasked with designing an end-to-end machine-learning ...
Perform matrix Candy Crush elimination
Question Implement a function that, given an m × n integer matrix representing colored blocks (same integers = same color), performs one round of "Can...